include/linux/shmem_fs.h

   1 #ifndef __SHMEM_FS_H
   2 #define __SHMEM_FS_H
   3
   4 #include <linux/swap.h>
   5 #include <linux/mempolicy.h>
   6
   7 /* inode in-kernel data */
   8
   9 #define SHMEM_NR_DIRECT 16
  10
  11 struct shmem_inode_info {
  12         spinlock_t              lock;
  13         unsigned long           flags;
  14         unsigned long           alloced;        /* data pages alloced to file */
  15         unsigned long           swapped;        /* subtotal assigned to swap */
  16         unsigned long           next_index;     /* highest alloced index + 1 */
  17         struct shared_policy    policy;         /* NUMA memory alloc policy */
  18         struct page             *i_indirect;    /* top indirect blocks page */
  19         swp_entry_t             i_direct[SHMEM_NR_DIRECT]; /* first blocks */
  20         struct list_head        swaplist;       /* chain of maybes on swap */
  21         struct inode            vfs_inode;
  22 };
  23
  24 struct shmem_sb_info {
  25         unsigned long max_blocks;   /* How many blocks are allowed */
  26         unsigned long free_blocks;  /* How many are left for allocation */
  27         unsigned long max_inodes;   /* How many inodes are allowed */
  28         unsigned long free_inodes;  /* How many are left for allocation */
  29         spinlock_t stat_lock;       /* Serialize shmem_sb_info changes */
  30         uid_t uid;                  /* Mount uid for root directory */
  31         gid_t gid;                  /* Mount gid for root directory */
  32         mode_t mode;                /* Mount mode for root directory */
  33         struct mempolicy *mpol;     /* default memory policy for mappings */
  34 };
  35
  36 static inline struct shmem_inode_info *SHMEM_I(struct inode *inode)
  37 {
  38         return container_of(inode, struct shmem_inode_info, vfs_inode);
  39 }
  40
  41 #ifdef CONFIG_TMPFS_POSIX_ACL
  42 int shmem_permission(struct inode *, int);
  43 int shmem_acl_init(struct inode *, struct inode *);
  44
  45 extern struct xattr_handler shmem_xattr_acl_access_handler;
  46 extern struct xattr_handler shmem_xattr_acl_default_handler;
  47
  48 extern struct generic_acl_operations shmem_acl_ops;
  49
  50 #else
  51 static inline int shmem_acl_init(struct inode *inode, struct inode *dir)
  52 {
  53         return 0;
  54 }
  55 #endif  /* CONFIG_TMPFS_POSIX_ACL */
  56
  57 #endif